If you don't have a separate graphics card, a 1GB system will have trouble running the game. A chipset graphics processor on board video memory is usually less than half the listed video memory. The rest is made up of slower system memory.
Running SH4 on a system with 1GB of memory works better if you shut down all of the unused programs that eat up memory in the background. This also includes the massive amount of memory used by unneeded Windows services. To run the game with better graphics on my 1 GB Athlon dual core with a 8800gt graphics card, I reduced the XP operating footprint to less than 200 MB.
If you are not familiar with what services are essential for Windows to operate there are sites available to help you to know which ones you can safely disable.
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